Malicious PDF — malware analysis report

Static analysis result for SHA-256 9411d73dd30fa0f4…

MALICIOUS

PDF

86.0 KB Created: 2021-08-23 10:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-12
MD5: 99c463b50141ef0b8cb52920362cc39a SHA-1: 9ce243009a6d5abb00df6a9857d4cccd10a318dc SHA-256: 9411d73dd30fa0f469e5b8deb2981235348f63d23bd0ea2a320cb8d46a99598f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself is also flagged for suspicious link farming and duplicate object definitions, further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610bf9aa1597e---4328143238.pdf In PDF document text
    • http://romengo.com/ckfinder/userfiles/files/22365003786.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e882690cd9---jigufamemoku.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46f81f411c---18217101698.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/14710773681.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/tapumiroretini.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/96680312964.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/nagitawamaxubikegarevid.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/896c7c8debdaf3a3b2cef39d9b69a13a/sozubo.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a29fe9c759---gobodalowotovunawila.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/nojeguda.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/905e2feb14e26a615edd71b7de8f5521/sapatonapikotaniku.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/68438691005.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e54150338d---51440804711.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/b2a9aa2ccd6e0793659c28a392f573ad/worowurujoti.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/bcecaa0272afa5e791df586fc6d25486/zesunupogod.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/78629745891.pdfIn PDF document text
    • http://goref.ru/files/file/noxakujoxekibexo.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/e5fc9793709f0d3f58e1ea1263f36136/sidifolofuka.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/11281086350.pdfIn PDF document text
    • http://german-ex.com/97026802955.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/99801125535.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/36997682065.pdfIn PDF document text
    • http://snsi.jp/image/news_file/61185514084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=check+if+pdf+is+signedPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE44 16560 bytes
SHA-256: d6a39edc6068bd1461bb660a4f541237799c0c7a2a7f8279d2fe8aa243e3230e
font_01_sfnt_off00011955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11955 10496 bytes
SHA-256: 160ae1c2df83dbb2a72d65c7956236c913cba5cb069c4b46d8160cef0dc568ff
font_02_sfnt_off000130ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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